After matching groups based on the number of missed questions, subjects were
assigned to either the 12:00 pm control group of symphony music or 12:30 pm treatment
group of rap music time slot to be administered another test the following Thursday
afternoo

Another explanation for our findings could be participants were aware of the
distractions during the rap music test. This conscious awareness of distractions attributed
to their attention during the experiment, and caused them to pay greater attention to

Notes Ch 9 and Ch 10
external cost (negative externality)
a cost of an activity that falls on people other than those who pursue the activity
external benefit (or positive externality)
a benefit of an activity received by people other than those who pursu